Free Developer Tools for 2026
17 essential utilities for formatting, encoding, validating, and converting. All tools run in your browser—no server uploads, completely private, no signup required.
Why Developers Love These Tools
100% Private
All processing happens in your browser. Your data never touches our servers.
Lightning Fast
No server round-trips. Instant results with client-side processing.
Always Free
No signup, no credit card, no hidden fees. Use as much as you need.
Featured Developer Tools
Format and validate JSON with syntax highlighting
Common Use Cases:
Example: Format messy JSON from API responses with proper indentation
Encode and decode Base64 strings instantly
Common Use Cases:
Example: Encode credentials for HTTP Basic Authentication
Decode and inspect JSON Web Tokens
Common Use Cases:
Example: Decode JWT tokens to inspect user claims and expiration
Test and debug regular expressions in real-time
Common Use Cases:
Example: Test regex patterns for email validation before deployment
Generate secure random passwords
Common Use Cases:
Example: Generate cryptographically secure passwords for user accounts
All Developer Tools
JSON Formatter
Format and validate JSON with syntax highlighting
Base64 Encoder/Decoder
Encode and decode Base64 strings instantly
JWT Decoder
Decode and inspect JSON Web Tokens
Regex Tester
Test and debug regular expressions in real-time
SQL Formatter
Format and beautify SQL queries
GraphQL Formatter
Format and validate GraphQL queries
YAML to JSON
Convert YAML to JSON format
XML to JSON
Convert XML to JSON format
CSV to JSON
Convert CSV data to JSON format
URL Encoder/Decoder
Encode and decode URL strings
URL Parser
Parse and analyze URL components
HTML Entity Encoder
Encode and decode HTML entities
UUID Generator
Generate unique identifiers (UUIDs)
Password Generator
Generate secure random passwords
SHA256 Hash Generator
Generate SHA256 hashes from text
Cron Expression Generator
Create and validate cron expressions
Base64 to PDF
Convert Base64 strings to PDF files
Embed Tools on Your Website
Add any of these tools to your blog, documentation, or website. Free to use, no attribution required.
Example Embed Code
<iframe
src="https://prompttools.dev/tools/json-formatter?embed=true"
width="600"
height="400"
frameborder="0"
title="JSON Formatter"
style="border: 1px solid #e5e7eb; border-radius: 8px;"
></iframe>Visit any tool page and look for the "Embed" section to get the code for that specific tool.
Popular Use Cases
🔍 API Development & Testing
Format JSON responses, decode JWT tokens, test regex patterns, and encode URL parameters.
- • Debug API responses with JSON formatter
- • Inspect JWT claims and expiration
- • Validate input patterns with regex tester
📊 Data Transformation
Convert between CSV, JSON, YAML, and XML for data migration and integration.
- • Import CSV data as JSON
- • Convert config files between formats
- • Transform API responses
🔐 Security & Encoding
Encode sensitive data, generate secure passwords, and create cryptographic hashes.
- • Generate secure passwords
- • Create SHA-256 hashes
- • Encode data with Base64
⚡ Performance Optimization
Minify HTML and CSS to reduce file sizes and improve load times.
- • Minify production code
- • Reduce bundle sizes
- • Optimize page load speed
Frequently Asked Questions
Are these tools really free?
Yes, 100% free with no signup, no credit card, and no hidden fees. Use them as much as you need for personal or commercial projects.
Is my data secure?
Absolutely. All tools run entirely in your browser using client-side JavaScript. Your data never leaves your computer and is not uploaded to any server.
Can I embed these tools on my website?
Yes! All tools can be embedded on your blog, documentation, or website. No attribution required, but appreciated.
Do I need to install anything?
No installation required. These are web-based tools that work directly in your browser on any device.
Can I use these tools offline?
Once the page loads, most tools work offline since all processing happens in your browser.
Start Using Free Developer Tools Today
No signup required. No credit card needed. Just click and start using.
Try JSON Formatter Now →